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Technical Support / Wired Audio PAW to Intercom volume control
« on: November 02, 2020, 01:07:45 pm »
I'm planning two PAW Rosetta installations for group aircraft (some individuals will use their own tablets, other wont) so plan to pipe audio into the intercoms of the aircraft (one a Sigtronics SPA-400, one built into Trig COM).
Firstly, I assume that the Pi audio output is powerful enough to go into the Aux input of these? That doesn't appear clear from various threads (and whether the Pi audio can be software boosted).
Secondly, to be able to suppress alerts in the circuit, I need a volume control. My ideal would be a single knob which controls power to the PAW (initial "click") then adjusts volume, in a similar way to a Garmin COM. Even better if the knob was illuminated to show power was getting through the switch. Any particular suggestions? What potentiometer Ohms is required? One aircraft is 12V, the other 28V. If I can't find a suitable dual purpose knob, I could separate out power to a simple toggle.
Firstly, I assume that the Pi audio output is powerful enough to go into the Aux input of these? That doesn't appear clear from various threads (and whether the Pi audio can be software boosted).
Secondly, to be able to suppress alerts in the circuit, I need a volume control. My ideal would be a single knob which controls power to the PAW (initial "click") then adjusts volume, in a similar way to a Garmin COM. Even better if the knob was illuminated to show power was getting through the switch. Any particular suggestions? What potentiometer Ohms is required? One aircraft is 12V, the other 28V. If I can't find a suitable dual purpose knob, I could separate out power to a simple toggle.